Method of casting chilled rolls.



J. B. HENRY.

METHOD 0F CASTING GHILLED ROLLS.

ArPLIoA'rIoN FILED JULY 12, 1909. BBNBWED Nov. 1o, 1911.

1,'01 1,430. Patented 1130.12, 1911,.

:fg-u 1 7 l f @214% o l that in order to get -the hard Working sur- JOHN B. HENRY, 0F ASPINWALL, PENNSYLVANIA.

METHOD 0F CASTING CHILLED ROLLS.`

Application lxed July 12, 1909, Serial No.` 507,182.

To all' whom it may concerns/ Bewit known that I, JOHN B. HENRY, a resident of Aspinwall, in the 4county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Methods of Casting Chilled Rolls, of which the following is a specification.

This invention relates to a method of casting hard rolls for rolling iron, steel or other metals, such as chilled iron rolls or high' carbon steel rolls.

The object of the invention is to provide a method for maln'n rolls of this character whereby breakage t ereof is largely overcome. -v

Rolls for rolling iron, steel or other metals frequently break in service due to the fact face desired on e rolls, it is necessa to cast them of a brittle metal, such as chilled iron or high carbon steel. These brittle rolls under the severe strain of usagevery i frequently break. Attempts have been made to overcome this b forming the center and necks of the roll ofya steel shaft and castin the body of chilled iron or high carbon stee thereon. This, however, has not been successful due `to .the strains induced in'. the body of the roll shrinkin on the rigid center. I overcome the d' culties stated by formin the center and outer portion ofthe rolls o different characters of metal, formingsaid parts by casting, and casting the -t'wo parts either simultaneously or in such close succession that the second part is poured before the first becomes rigid, thereby producing a thoroughv and intimate union of the parts and enabling the two partstocool and shrink uniformly and thus not induce internal strains.

In the accompanying drawing, Figure 1 is a vertical section through a mold, illus- `ltrating my method of casting a roll, and

Fig. 2 is a horizontal section therethrough.

In the drawing, the mold is shown atl, this preferably being a sand mold as is the usual practice. Thismold haslformed in it a cavit of the shape and size of the roll which 1t is desired to cast, and 1n case the roll is tol have its outer portion formed of chilled iron, there will be placed in the mold lthe'usual chill 2. The mold is divided by means of a' suitable fusible partition, shown in the form of a metallic shell or sleeve 3 provided'with end fianges 4 and which di- Specication of Letters atent. Patented Dec. 112, 1911.

-Benewed Novemberlo, V1911. Serial No. 659,868.v

partment 5 and an outer annular compartment 6. The central compartment 5 includes the portion to form the vnecks 7 of the roll, and is shownl of substantiall the same diameter as the necks although t is is not necessary as it may be of greater or lesser diameter than said necks. The shell 3 may be formed of any suitable metal which will fuse completely or partly when the molten metal is poured into the same. A gate or runner 8 leads to the central'compartment 5 and another" gate or runner 9 leads to the outer or annular compartment 6.

The shell 3 divides the mold cavity completely into two compartments and serves to keep the metalsforming the two parts of the roll separate from each other. The metal for the two compartmentsmay be poured simultaneously or that for the center may be poured first 'followed by that forming theouter or body ortion, or vice versa. -In case the metals o the two parts of the roll are poured successively, the metal poured --last will be poured before the first poured is rigid or has thoroughly set, so that the two parts become completely united by the fusing of the shell 3 and cool tovals gether and shrink uniformly, thus preventv ing the setting up of linternal strains. This process enables the roll center and the outer or working face of the roll to be cast of `metals of different characters or having different analysis, enabling the two parts to be formed of metal having special qualities particularly adapting the same to give the maximum strength or wearing qualities for that part of the roll. For instance, the central part may be of a low carbon steel to give very great strength, while the outer or annular portion may be of high carbon steel or-chilled iron. Consequently, the'roll will have the maximum strength without in any way impairing the hardness and wearing quality of its working face. I do not, however, limit the process to casting' the central part of steel and the outer part of high carbon steel or chilled iron, as each part of the roll may be formed of any desired metal or of the same metal but having a different analysis. .The shell 3 ma be made either of cast or pressed metal o the same or different character from either or both of the parts of the roll. It is ci such thickness that it prevents the metal poured into one paru-of the mold from entering the other part of the mold, and at the same time will practically fuse and become anintegral part of the completed roll casting. After casting, both parts of the roll cool at the same time and shrink uniformly so that the strains that are produced in case either part of the roll were solid and set when the other part is cast, are almost entirely overcome. |The resultant roll is, to all intents and purposes, an integral roll being composed of two different kinds or grades of metal thoroughly united and having maximum strength and .wearing qualities.

What I claim is,

1. The method of casting rolls having the central portion composed of a strong tough metal'and the outer surface of a hard brittle metal, consisting in separately casting the central and surface portions of the roll, one of said portions being poured first and the otherbeing poured before the first is set or becomes solid.

2. The method of casting rolls havingthe central and outer portions composed of different kinds or grades of metal, consisting in first pouring the central portion thereof of a strong tough metal, and before the same is set and become rigid, pouring the outer portion of a hard brittle metal and thereby causing the two parts to unite and cool and shrink simultaneously.

3. The method of casting rolls having the central and outer parts composed of different kinds or grades of metal, consisting'in completely dividing the mold by means of a fusible partition, first pouring into the central compartment a strong tough metal and into the outer compartment a hard brittleA metal, said metals being separately poured into the two compartments and causing the molten metal to fuse the partition and thereby cause the two metals to firmly unite.

. 4. The method of casting rolls having the central and outer portions thereof composed of metals of dierent grades or kinds, consisting in dividing the mold by means of a thin metal partition, first pouring a strong tough metal into the central compartment and then pouring a hard brittle metal into the outer compartment, the pouring of one of said metals being effected while the other metal is still at a high temperature.`

5. The method of casting rolls having the central and outer portions thereof composed of metals of diiferent grades or kinds, consisting in forming a mold with the mold cavity arranged vertically, dividing the same by means of a thin fusible partition intoan inner central compartment and an outer annular compartment, pouring into the central compartment a strong tough metal and into the outer compartment a hard brittle metal, said metals being separately poured into the two compartments from below in 'such time sequence that the'one is not set or rigid when the other is poured, said metals acting to fuse the partition and thereby cause the two metals to rmly unite.-

6. The method of casting rolls having the central and outer portions thereof composed of metals of different grades or kinds, consisting in forming a mold with the axis of the mold cavity vertical, placing in said mold a metal chill, dividing said mold by a thin metal partition into a central compartment and an outer annular compartment, pouring into the central compartment a strong tough metal and into the outer compartment a hard brittle metal, said metals being poured separately into the two compartments and entering through the bottom in such time sequence that the one is not set or rigid when the other ispoured, said metals serving to fuse the partition and thereby cause the two metals to firmly unite.

l In testimony whereof, I have hereunto set my hand.

Y JOHN B. HENRY.

Witnesses:

F. L. BnRvnnsDoRr, JAS. L. WELDON. 

